Ortega, 50, allegedly slashed Lucia and Leo Krim, 6 and 2, to death with a kitchen knife in a bathtub on Oct. 25. The children's mother discovered the gruesome scene when she returned home with her 3-year-old daughter from swimming class.

The nanny was already found fit to stand trial by two psychiatrists in April, but Rosenbaum argued on Monday that Ortega could not say what the date or year was in one of her interviews with her.

She had no idea why she was in a hospital, why there were police outside, or what she was charged with, Rosenbaum said.